Re: [Gretl-devel] matrix error
Allin Cottrell schrieb:
On Sat, 1 Mar 2008, Sven Schreiber wrote:
> The following produces an error on a post-1.7.2-build:
>
> matrix m1 = zeros(1,5)
> matrix m2 = ones(1,5)
> mymat = m1 | m2
>
> whereas this version works:
>
> matrix m1 = zeros(1,5)
> matrix m2 = ones(1,5)
> matrix mymat = m1 | m2
>
> I know the second variant (with explicit matrix declaration) is
> cleaner, but shouldn't the first one also work?
This is the old business of what "|" means: logical OR, or
vertical matrix concatenation?
Maybe for 1.7.4 it's time to insist on "||" for OR.
You mean 1.7.3 or 1.7.4? Maybe a big version number is better to
indicate backwards-incompatible changes? (Although gretl's versioning
scheme doesn't work along those lines I guess.)
I can live with the explicit matrix declaration and don't want to push
any potentially code-breaking changes. But if the change is applied, I
think it would be a good idea to make the error message about "|" in
non-matrix contexts informative, for example "Concatenation '|' only
valid with matrices (the logical OR operator is now '||')".
cheers,
sven